CN106328362B - A kind of toroidal transformer - Google Patents

Abstract

The invention provides a toroidal transformer. The toroidal transformer includes: at least one first toroidal core (41); at least one second toroidal core (42); and a first winding (5) surrounding the first toroidal core (41) And the second winding (6), and the third winding (7) around the outside of the first toroidal core (41) and the second toroidal core (42); the first winding (5) and the Any one of the second windings (6) is connected in series with the third winding (7). In the above solution, by integrating the reactor into the transformer, the reactor generates leakage inductance in the transformer and does not generate leakage magnetic flux at the same time. This transformer design with integrated reactor reduces the weight and size of the device, and at the same The power consumption is reduced, and the utilization efficiency of the transformer is improved.

Description

a toroidal transformer

technical field

The invention relates to the technical field of electronic products, in particular to a toroidal transformer.

Background technique

In a traditional transformer, the leakage inductance can be obtained by connecting an external additional reactor, which is connected to the primary winding of the transformer, or connected to the secondary winding of the transformer. These methods provide sufficient leakage inductance for the transformer alone. , although the required leakage inductance value can be obtained through an external additional reactor, this method of generating sufficient leakage inductance with leakage flux will generate a larger leakage magnetic field, additional loss and noise; at the same time, this design makes The circuit and the magnetic circuit are bulky, which reduces the working efficiency of the transformer while increasing the weight and cost of the transformer.

As shown in Figure 1, an independent transformer and an independent additional reactor are used in the traditional design. The specific connection method is: the transformer 10 and the additional reactor 20 are independently designed, and the transformer core 101 is provided with a first winding 1 and a second winding 1. winding 2, the reactor core 201 is provided with a third winding 3, the last turn 12 of the first winding 1 is connected in series with the first turn 31 of the third winding 3, and the first turn 31 of the first winding 1 The turn 11 and the last turn 32 of the third winding 3 serve as the input end of the transformer 10 ; the first turn 21 and the last turn 22 of the second winding 2 serve as the output end of the transformer 10 .

Contents of the invention

The technical problem to be solved by the present invention is to provide a toroidal transformer to solve the existing problem that a separate reactor is usually used to provide the leakage inductance value for the transformer, but this method of generating sufficient leakage inductance with the leakage magnetic flux will produce more Large leakage magnetic field, additional loss and noise; at the same time, this design makes the circuit and magnetic circuit bulky, which increases the weight and cost of the transformer and reduces the working efficiency of the transformer.

In order to solve the above technical problems, an embodiment of the present invention provides a toroidal transformer, including:

at least one first toroidal core 41;

at least one second toroidal core 42; and

a first winding 5 and a second winding 6 surrounding the first toroidal core 41, and a third winding 7 surrounding the first toroidal core 41 and the second toroidal core 42;

Any one of the first winding 5 and the second winding 6 is connected in series with the third winding 7 .

Further, the first annular magnetic core 41 is the main magnetic circuit of the transformer, the second annular magnetic core 42 is the main magnetic circuit of the reactor and the leakage flux magnetic circuit of the transformer at the same time, and the second annular magnetic core The core 42 is disposed in the central hole of the first annular magnetic core 41 .

Further, the upper surface of the first annular magnetic core 41 and the upper surface of the second annular magnetic core 42 or the lower surface of the first annular magnetic core 41 and the lower surface of the second annular magnetic core 42 At least one of them is on the same level.

Further, the second annular magnetic core 42 is disposed at the central hole of the first annular magnetic core 41 after the first winding 5 and the second winding 6 are wound.

Further, when the third winding 7 and the first winding 5 are connected in series, the last turn 52 of the first winding 5 is connected in series with the first turn 71 of the third winding 7, and the first The first turn 51 of the winding 5 and the last turn 72 of the third winding 7 are used as the input end of the toroidal transformer, and the first turn 61 and the last turn 62 of the second winding 6 are used as the input ends of the toroidal transformer. output.

Further, when the third winding 7 and the second winding 6 are connected in series, the last turn 62 of the second winding 6 is connected in series with the first turn 71 of the third winding 7, and the first The first turn 51 and the last turn 52 of the winding 5 are used as the input ends of the toroidal transformer, and the first turn 61 of the second winding 6 and the last turn 72 of the third winding 7 are used as the input ends of the toroidal transformer. output.

Further, the first winding 5 is the primary winding of the toroidal transformer, and the toroidal transformer includes at least one primary winding; the second winding 6 is the secondary winding of the toroidal transformer, and the toroidal transformer Contains at least one secondary winding.

Further, when there are multiple third windings, the multiple third windings are arranged in parallel outside the first annular magnetic core 41 and the second annular magnetic core 42 .

Further, the first winding 5 , the second winding 6 and the third winding 7 are distributed at intervals on the outer diameter surface of the first ring magnetic core 41 .

Further, an insulating layer is provided on the first winding 5 and the second winding 6 .

The beneficial effects of above-mentioned technical scheme of the present invention are as follows:

In the above solution, by integrating the reactor into the transformer, the reactor will generate leakage inductance in the transformer while not generating leakage flux. This kind of transformer design with integrated reactor reduces the weight of the device and reduces the size of the device. At the same time, the power consumption is reduced, and the utilization efficiency of the transformer is improved.

Description of drawings

Fig. 1 is the equivalent circuit wiring diagram of independent transformer and independent additional reactor winding connection in the prior art;

The schematic diagram of the toroidal transformer of the embodiment of the present invention in Fig. 2;

Fig. 3 is a radial sectional view of the toroidal transformer according to the embodiment of the present invention;

Fig. 4 is the equivalent circuit connection diagram of embodiment one of the present invention shown in Fig. 1;

FIG. 5 is an equivalent circuit connection diagram of Embodiment 2 of the present invention shown in FIG. 1 .

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

The present invention is aimed at the existing single reactor that usually provides the leakage inductance value for the transformer, but this way of generating sufficient leakage inductance with the leakage flux will produce larger leakage magnetic field, additional loss and noise; at the same time, this design , making the circuit and the magnetic circuit bulky, increasing the weight and cost of the transformer while reducing the working efficiency of the transformer, and providing a toroidal transformer.

As shown in Figure 2 and Figure 3, the toroidal transformer in the embodiment of the present invention includes:

at least one first toroidal core 41;

at least one second toroidal core 42; and

a first winding 5 and a second winding 6 surrounding the first toroidal core 41, and a third winding 7 surrounding the first toroidal core 41 and the second toroidal core 42;

Any one of the first winding 5 and the second winding 6 is connected in series with the third winding 7 .

It should be noted that the first annular magnetic core 41 is the main magnetic circuit of the transformer (that is, the first annular magnetic core 41 is a transformer magnetic core), and the second annular magnetic core 42 is also the main magnetic circuit of the reactor. circuit and the leakage flux magnetic circuit of the transformer (that is, the second annular magnetic core 42 is a reactor magnetic core), the magnetic permeability of the first annular magnetic core 41 and the second annular magnetic core 42 can be the same or It can be different, and the specific magnetic permeability setting value is determined by the use environment of the toroidal transformer. Specifically, the first winding 5 surrounding the outside of the transformer magnetic core is the primary winding of the toroidal transformer, and the first winding 5 surrounding the magnetic core of the transformer is The second winding 6 outside the core is the secondary winding of the toroidal transformer.

Specifically, the second annular magnetic core 42 is arranged in the central hole of the first annular magnetic core 41, and the first annular magnetic core 41 and the second annular magnetic core 42 are located on the same coordinate plane, namely There is at least one of the upper surface of the first annular magnetic core 41 and the upper surface of the second annular magnetic core 42 or the lower surface of the first annular magnetic core 41 and the lower surface of the second annular magnetic core 42 on the same level.

It should be noted that when the first annular magnetic cores 41 have multiple components, and when the radial dimensions of the plurality of first annular magnetic cores are the same, the plurality of first annular magnetic cores 41 are concentrically stacked. Setting; when the radius sizes of the plurality of first annular magnetic cores are different, between the plurality of first annular magnetic cores 41 are arranged on a concentric co-coordinate plane, similarly, when the second annular magnetic core 42 has many When composed, the arrangement of the plurality of second annular magnetic cores 42 is similar to the arrangement of the plurality of first annular magnetic cores 41 .

In the above solution, by integrating the reactor into the transformer, the reactor will generate leakage inductance in the transformer while not generating leakage magnetic flux. This kind of transformer design with integrated reactor reduces the weight of the device, reduces the size of the device, and at the same time The power consumption is reduced, and the utilization efficiency of the transformer is improved.

As shown in Fig. 2, Fig. 3 and Fig. 4, the first winding 5 and the second winding 6 are surrounded outside the first toroidal magnetic core 41 of the toroidal transformer 4, and the third winding 7 is surrounded by the reactor 40 at the same time The second toroidal core 42 of the toroidal transformer 4 and the outside of the first toroidal core 41 of the toroidal transformer 4. When the third winding 7 and the first winding 5 of Embodiment 1 of the present invention are connected in series, the first winding 5 The last turn 52 of the first winding 7 is connected in series with the first turn 71 of the third winding 7, and the first turn 51 of the first winding 5 and the last turn 72 of the third winding 7 are used as the input of the toroidal transformer end, the first turn 61 and the last turn 62 of the second winding 6 serve as the output ends of the toroidal transformer.

As shown in Fig. 2, Fig. 3 and Fig. 5, the first winding 5 and the second winding 6 are surrounded outside the first toroidal magnetic core 41 of the toroidal transformer 4, and the third winding 7 is surrounded by the reactor 40 at the same time The second toroidal core 42 of the toroidal transformer 4 and the outside of the first toroidal core 41 of the toroidal transformer 4. When the third winding 7 and the second winding 6 of the second embodiment of the present invention are connected in series, the second winding 6 The last turn 62 of the first winding 7 is connected in series with the first turn 71 of the third winding 7, the first turn 51 and the last turn 52 of the first winding 5 are used as the input end of the toroidal transformer, and the second winding The first turn 61 of 6 and the last turn 72 of the third winding 7 serve as the output end of the toroidal transformer.

It should be noted that whether the third winding 7 is specifically connected to the primary winding or the secondary winding on the transformer magnetic core is determined by the environment in which the transformer is used.

In the above solution, the third winding and the first winding or the third winding and the second winding are connected in series by welding or brazing, so that the third winding becomes a part of the transformer winding. It should be noted that , the winding of the winding and the connection between the windings are well known to those skilled in the art, and will not be described in detail here.

Specifically, the assembly process of the toroidal transformer is as follows: enclosing the primary winding and the secondary winding on the outside of the first toroidal core respectively (it should be noted that the primary winding and the secondary winding enclosing the first toroidal core are Insulation treatment is required between the secondary windings, and the insulation treatment method described here is generally to set an insulating layer on the primary winding and the secondary winding respectively), and then place the second ring magnetic core on the primary winding and the secondary winding after the winding is completed. At the central hole of the first toroidal magnetic core after the primary winding, then use the third winding to simultaneously surround the first toroidal magnetic core and the second toroidal core, and finally connect the third winding to the primary winding It is connected in series with any one of the secondary windings to form a whole. It should be noted that, for a toroidal transformer wound with complete windings, the primary winding, secondary winding and the tertiary winding are distributed at intervals on the outer diameter surface of the first toroidal magnetic core.

It should be noted that there may be one or more than one primary winding, secondary winding and third winding, and the multiple windings of the same type are connected in parallel.

The above scheme of the present invention avoids the use of a separate reactor to provide the leakage inductance value for the transformer, but this method of generating sufficient leakage inductance with the leakage flux will generate larger leakage magnetic field, additional loss and noise; at the same time, this design , making the circuit and magnetic circuit bulky, increasing the weight and cost of the transformer while reducing the working efficiency of the transformer. By integrating the transformer and the reactor as a whole, the reactor generates leakage inductance in the transformer and does not generate Leakage flux, this design reduces the volume of the circuit and magnetic circuit, and improves the working efficiency of the transformer.

What has been described above is a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications can also be made without departing from the principle of the present invention. These improvements and modifications should also be considered as Be the protection scope of the present invention.

Claims (9)

1. A toroidal transformer, characterized in that, comprising: at least one first toroidal core (41); at least one second toroidal core (42); and The first winding (5) and the second winding (6) surrounding the first toroidal core (41), and the first toroidal core (41) and the second toroidal core (42) external tertiary winding (7); Any one of the first winding (5) and the second winding (6) is connected in series with the third winding (7); Wherein, the first annular magnetic core (41) is the main magnetic circuit of the transformer, the second annular magnetic core (42) is the main magnetic circuit of the reactor and the leakage flux magnetic circuit of the transformer at the same time, and the first Two annular magnetic cores (42) are arranged in the central hole of the first annular magnetic core (41). 2. The toroidal transformer according to claim 1, characterized in that, the upper surface of the first toroidal core (41) is in contact with the upper surface of the second toroidal core (42) or the first toroidal core At least one of the lower surface of the core (41) and the lower surface of the second annular magnetic core (42) is on the same level. 3. The toroidal transformer according to claim 1, characterized in that, the second toroidal magnetic core (42) is arranged on the first toroidal magnetic core after winding the first winding (5) and the second winding (6). At the central hole of the core (41). 4. The toroidal transformer according to claim 3, characterized in that, when the third winding (7) and the first winding (5) are connected in series, the last turn of the first winding (5) ( 52) is connected in series with the first turn (71) of the third winding (7), the first turn (51) of the first winding (5) is connected with the last turn of the third winding (7) ( 72) As the input end of the toroidal transformer, the first turn (61) and the last turn (62) of the second winding (6) are used as the output end of the toroidal transformer. 5. The toroidal transformer according to claim 3, characterized in that, when the third winding (7) and the second winding (6) are connected in series, the last turn of the second winding (6) ( 62) connected in series with the first turn (71) of the third winding (7), the first turn (51) and the last turn (52) of the first winding (5) are used as the input of the toroidal transformer end, the first turn (61) of the second winding (6) and the last turn (72) of the third winding (7) serve as the output ends of the toroidal transformer. 6. The toroidal transformer according to claim 1, characterized in that, the first winding (5) is the primary winding of the toroidal transformer, and the toroidal transformer comprises at least one primary winding; the second winding ( 6) is the secondary winding of the toroidal transformer, and the toroidal transformer includes at least one secondary winding. 7. The toroidal transformer according to claim 1, characterized in that, when there are multiple third windings, the multiple third windings are arranged in parallel between the first toroidal magnetic core (41) and the first toroidal core (41). The outside of the two ring magnetic cores (42). 8. The toroidal transformer according to claim 1, characterized in that, the first winding (5), the second winding (6) and the third winding (7) are in the first toroidal core (41 ) are distributed at intervals on the outer diameter surface. 9. The toroidal transformer according to claim 1, characterized in that an insulating layer is provided on the first winding (5) and the second winding (6).